Effect of pulse shaping on coupling efficiency of laser spot welding in AZ31 magnesium alloy

IF 2.9 3区工程技术 Q2 AUTOMATION & CONTROL SYSTEMS

International Journal of Advanced Manufacturing Technology Pub Date : 2024-03-23 DOI:10.1007/s00170-024-13421-1

Pengfei Zhao, Xiaobin Zhang, Shuwang Bian, Wenlong Zhang, Zhanyi Cao

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Abstract

Energy coupling efficiency has an important effect on welding quality in pulsed laser spot welding. In this paper, laser spot welding experiments are conducted on 3 mm AZ31 magnesium alloy using an AC-500 W Nd:YAG pulsed laser welder. Results show that the rectangular pulse (R) energy coupling is the most efficient when peak power is less than or equal to 3 kW, but the energy coupling of ramp-up pulse (R-U) is the most efficient when peak power is greater than 3 kW. When the peak power is 4 kW, the energy coupling efficiency of laser spot welding under R-U pulse is the highest. At this time, the cross-sectional area of welding spot reaches 1.3 mm², peak temperature is 1550 ℃, the metal loss of melting pool is 4.4 mg, the depth-to-width ratio of keyhole is 1.06, and the laser absorptance is 0.9. In addition, a numerical model of velocity field of transient keyhole laser spot welding is established by using ANSYS, and the shape and size of keyhole are calculated during laser spot welding. The mechanism of pulse shaping to improve the energy coupling efficiency of deep-melt laser welding of magnesium alloys is revealed.

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脉冲整形对 AZ31 镁合金激光点焊耦合效率的影响

能量耦合效率对脉冲激光点焊的焊接质量有重要影响。本文使用 AC-500 W Nd:YAG 脉冲激光焊接机对 3 mm AZ31 镁合金进行了激光点焊实验。结果表明，当峰值功率小于或等于 3 kW 时，矩形脉冲（R）的能量耦合效率最高，但当峰值功率大于 3 kW 时，升压脉冲（R-U）的能量耦合效率最高。当峰值功率为 4 kW 时，R-U 脉冲下激光点焊的能量耦合效率最高。此时，焊点横截面积达到 1.3 mm2，峰值温度为 1550 ℃，熔池金属损耗为 4.4 mg，键孔深宽比为 1.06，激光吸收率为 0.9。此外，利用 ANSYS 建立了瞬态键孔激光点焊速度场数值模型，并计算了激光点焊过程中键孔的形状和尺寸。揭示了脉冲整形提高镁合金深熔激光焊接能量耦合效率的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Advanced Manufacturing Technology 工程技术-工程：制造

CiteScore

5.70

自引率

17.60%

发文量

2008

审稿时长

62 days

期刊介绍： The International Journal of Advanced Manufacturing Technology bridges the gap between pure research journals and the more practical publications on advanced manufacturing and systems. It therefore provides an outstanding forum for papers covering applications-based research topics relevant to manufacturing processes, machines and process integration.